OBD-II code · Powertrain (generic, extended)
P2404 EVAP Leak Detection Pump Sense Circuit Range/Performance
The sense (reed-switch or current-feedback) signal from the leak-detection pump is electrically valid but does not match expectations during a leak test. Often a worn pump diaphragm or a sticking reed contact.
Is it safe to drive with P2404?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyPump diaphragm worn
- PossibleReed switch intermittent
- Less likelySensor element aged beyond calibration window
Symptoms
- Check engine light on
- Possible smell of fuel near tank or engine bay
- Failed emissions inspection
- Loose-cap warning may appear
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–2 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Evap Leak Detection Pump, Evap Pump Wiring
Related codes
- P2400EVAP Leak Detection Pump Control Circuit Open
- P2407EVAP Leak Detection Pump Sense Circuit Range/Performance
- P2401EVAP Leak Detection Pump Control Circuit Low
- P2402EVAP Leak Detection Pump Control Circuit High
- P2403EVAP System Leak Detection Pump Sense Circuit Open
- P2405EVAP System Leak Detection Pump Sense Circuit Low
- P2406EVAP System Leak Detection Pump Sense Circuit High
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.